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Note 10 - Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Commercial
   
Residential
   
Total
 
Year ended December 31, 2018
   
25
%    
75
%    
100
%
Year ended December 31, 2017
   
27
%    
73
%    
100
%
Year ended December 31, 2016
   
26
%    
74
%    
100
%